Isaiah 7:2

And it was told the house of David Ahaz and his royal relations and courtiers. He calls them the house of David, to intimate that the following comfortable message was sent to Ahaz, not for his own sake, but only for the sake of his worthy progenitor David, to whom God had promised an everlasting kingdom. Syria is confederate with Ephraim With the kingdom of the ten tribes, commonly called Ephraim, because that tribe was by far the most numerous and potent of them. And his heart was moved Namely, the heart of Ahaz; and the heart of his people With excessive fear, arising partly from a consciousness of their own guilt, whereby they had put themselves out of God's protection; and partly from the consideration of the great strength and power of their enemies.